What should be done if Brake Pipe pressure falls below 90 pounds?

Treating a situation where Brake Pipe pressure falls below 90 pounds as a Brake Pipe rupture is critical for ensuring safety and maintaining the integrity of train operations. When the brake pipe pressure dips below this level, it indicates a significant potential issue that could compromise the braking system's effectiveness, ultimately impacting the ability to stop the train safely and efficiently.

When the brake pipe pressure is below the specified threshold, it often signals that the normal braking pressure cannot be maintained, which could lead to unintentional delays in response or complete brake system failure. By treating this condition as a rupture, immediate actions can be taken to address the issue, such as stopping the train or conducting an inspection to identify the cause of the pressure drop. This approach prioritizes safety and helps prevent accidents that could arise from inadequate braking power.

In contrast, notifying the Trainmaster or checking the air compressor switches may not address the immediate safety risks posed by low brake pipe pressure and could delay necessary action. Continuing to operate without acknowledging the drop in brake pipe pressure can lead to serious operational hazards.